WO2013117273A1 - Procédé pour le revêtement par immersion à chaud d'un produit plat en acier - Google Patents

Procédé pour le revêtement par immersion à chaud d'un produit plat en acier Download PDF

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Publication number
WO2013117273A1
WO2013117273A1 PCT/EP2012/075402 EP2012075402W WO2013117273A1 WO 2013117273 A1 WO2013117273 A1 WO 2013117273A1 EP 2012075402 W EP2012075402 W EP 2012075402W WO 2013117273 A1 WO2013117273 A1 WO 2013117273A1
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WO
WIPO (PCT)
Prior art keywords
atmosphere
flat steel
holding
dew point
steel product
Prior art date
Application number
PCT/EP2012/075402
Other languages
German (de)
English (en)
Inventor
Marc Blumenau
Christoper GUSEK
Fred Jindra
Rudolf Schönenberg
Hans-Joachim Krautschick
Original Assignee
Thyssenkrupp Steel Europe Ag
Thyssenkrupp Nirosta Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thyssenkrupp Steel Europe Ag, Thyssenkrupp Nirosta Gmbh filed Critical Thyssenkrupp Steel Europe Ag
Priority to JP2014555957A priority Critical patent/JP5796142B2/ja
Priority to KR1020147025029A priority patent/KR101994989B1/ko
Priority to CN201280069241.0A priority patent/CN104245995B/zh
Priority to EP12810177.1A priority patent/EP2812458B8/fr
Priority to US14/377,337 priority patent/US9803270B2/en
Priority to IN1579MUN2014 priority patent/IN2014MN01579A/en
Priority to ES12810177.1T priority patent/ES2593531T3/es
Publication of WO2013117273A1 publication Critical patent/WO2013117273A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/012—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C18/00—Alloys based on zinc
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C18/00—Alloys based on zinc
    • C22C18/04—Alloys based on zinc with aluminium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C23C2/004—Snouts
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips

Definitions

  • the invention relates to a method for
  • Hot dip coating a flat steel product with a metallic protective layer wherein the steel from which the flat steel product is produced contains at least 2.0 wt% Ni and at least 5.0 wt% Cr.
  • flat steel products this refers to steel strips or sheets and blanks and blanks derived therefrom.
  • Ni stabilizes the austenitic microstructure towards steels in steels. This effect can be used selectively to improve the mechanical material properties of the steel. Thus, multiphase steels with retained austenite part have a particularly good combination of strength and ductility. Fully austenitic
  • Ni steels with An additional alloy content of Cr is characterized by a particularly good chemical resistance and high corrosion resistance.
  • the presence of Mo in the respective steel supports this passivation
  • Cryogenic applications include vehicle construction, in particular structural components in the chassis area, chemical apparatus construction, mechanical engineering and plant construction. Furthermore, with Ni-alloyed steels, for example, decorative
  • alloy constituents critical in this regard include Cr, Al, Mn, Si and other oxide-forming elements. The from these alloying elements at the
  • Process is a steel strip after it is in a
  • Continuous furnace has been annealed recrystallizing immersed briefly in a metallic molten bath, which is typically based on zinc, aluminum or their alloys.
  • JP 3 111 546 A and JP 5 311 380 A each
  • EP 2 184 376 A1 mentions an off ⁇ line precoating, in which the
  • Fe-Flash a thin Fe layer
  • Hot dipping refinement Cr alloyed steels presuppose that the hot dip coating is carried out as a fire aluminizer, but are generally not concerned with the application of a zinc based one
  • Hot-dip coating of Ni- / Cr-alloyed steels in everyday operations opposes the problem that they are based on a conventionally designed
  • Hot dip coating equipment which is suitable for in
  • the above-described known proposals for the hot dipping refinement of Cr-alloyed steels relate only to ferritic stainless steels. Consequently, the Ni content of the respective steel alloys is limited to a comparatively low upper limit of ⁇ 3.0% by weight, provided that a Ni content is provided at all. It is known from the prior art that the presence of Ni on a flat steel product to be coated by hot dipping can be quite advantageous. So can by a pre-coating of the
  • Ni-Flash Ni-Flash
  • Ni content of the steel alloy itself can be used to improve the quality of a metallic hot dip coating.
  • a nickel content of up to 2.0% by weight of Ni is added to the steel of the respective flat steel product to be coated in order to produce the
  • the object of the invention was to provide a method which the
  • Hot-dip finishing Ni-alloyed steel flat products are cost-effective and resource-efficient, while being process-stable in industrial practice.
  • the inventive method is for the
  • Hot-dip coating of cold or hot rolled flat steel products suitable in one
  • the process according to the invention comprises the following process steps, which are carried out successively in-line: a) provision of a flat steel product, b) heating of the flat steel product to one
  • inventive method provides for
  • Hot dip coating a high-Ni and Cr-containing flat steel product with a metallic protective layer at least the following steps: a) providing one by cold or hot rolling
  • the dew point TPl is set to -15 ° C to +30 ° C and in addition to N 2 and technically unavoidable impurities each optionally one or more of the following constituents (in Vol .-%): H 2 : 1-50 %, CO: 0.1-2.0%, C0 2 : 5.0-15.0%; c) holding the heated steel flat product in the following constituents (in Vol .-%): H 2 : 1-50 %, CO: 0.1-2.0%, C0 2 : 5.0-15.0%; c) holding the heated steel flat product in the
  • Holding temperature over a holding period of 10 - 120 s under a holding atmosphere consisting of N 2 and technically unavoidable impurities and 1.0 - 50.0 vol .-% H 2 and up to 1.0 vol .-% 0 2 and their Dew point TP2 is set to -30 ° C to 0 ° C; d) cooling the steel flat product from the holding temperature to a 430-800 ° C
  • Strip entry temperature e) passing the flat steel product through a
  • the dew point TPl of the heating atmosphere is higher than the dew point TP2 of the holding atmosphere and the dew point TP2 is higher than the dew point TP4 of the trunk atmosphere.
  • the thickness of the metallic coating present on the steel flat product emerging from the melt bath can be adjusted as the result
  • the flat steel product to be provided can be used as
  • the invention is based on the idea that the
  • Oxidation which manifests itself by oxide formation on the surface of the flat steel product, is largely completely prevented. Optimally, therefore, all heat treatment steps of the inventive method under a reducing atmosphere in
  • Atmospheric components can be avoided in this case, so that targeted one except on technical
  • step a) Flat steel product in step a) are performed in a directly heated furnace zone, so in this case, the heating atmosphere is adjusted so that in addition to N 2 and the optionally present H 2 maximum
  • Heating zone adjusted such that an external
  • a significant advantage of the method according to the invention is thus that it is possible to dispense with targeted pre-oxidation, as prescribed by some of the known methods. In this way, the associated with the implementation of the method control and control effort is significantly reduced.
  • the heated steel flat product according to the invention is annealed at the holding temperature for 10-120 s.
  • the holding atmosphere prevailing in the holding zone, the holding period, the holding temperature and the dew point TP 2 of the holding atmosphere are coordinated so that at the end of the holding phase the structure of the
  • the 02 content of the holding atmosphere can be limited to a maximum of 0.1% by volume at the same time.
  • the dew point TP2 of the holding atmosphere is adjusted so that an external oxidation of the
  • the dew point TP2 to at least -30 ° C, in particular higher than -30 ° C, set. At lower dew points there is a risk that base alloying elements such. As Cr, Mn or Si, form external oxides. At the same time, according to the invention, the dew point TP2 should be at most 0 ° C., in order to have a sufficient reduction potential, possibly at the surface of the
  • the temperature of the steel strip within a cooling zone is cooled from the holding temperature to a strip inlet temperature at which the flat steel product dips into the respective molten bath, which is in the range of 430-800 ° C.
  • the specific band entry temperature chosen depends on it as well the temperature of the melt bath through which the
  • Protective layer is guided, depending on whether the coating is based on zinc or aluminum based.
  • the flat steel product can undergo overaging treatment as process step d '), in which the flat steel product is exposed to an overaging atmosphere for 1 to 30 s
  • unavoidable impurities optionally 1 - 50 vol .-% H 2 , in particular 1-5 vol .-% H 2 , and wherein the
  • Dew point TP3 of the over-aging atmosphere is set to -50 ° C to -25 ° C.
  • Proboscis can be made of N 2 and technically
  • the cooling of the flat steel product carried out according to the invention to the respective strip inlet temperature takes place under an inert or reducing atmosphere.
  • the cooling is carried out under the atmosphere prevailing in each case following the cooling step. This is the case that no overaging treatment
  • the melt bath charged in a suitable melt bath vessel of a type known per se is subsequently prepared from the one according to the invention
  • Steel flat product in a continuous pass happens, in practice, a dipping time of 1 - 10 s, especially 2 - 5 s, has proven.
  • the melt bath wets the steel surface, and a chemical reaction between the metallic iron of the steel strip and the melt bath results in an intermetallic boundary layer, which is the good one
  • a melt bath which is particularly suitable for the coating of a flat steel product of the type processed according to the invention can (all data in% by weight) contain, in addition to Zn and unavoidable impurities, 0.1-60.0%,
  • Impurities include traces of Si, Mn, Pb and rare earths.
  • Another melt bath composition contains, in addition to Zn and unavoidable impurities, 0.05-8.0% Al, 0.2-8.0% Mg, up to 2.0% Si, up to 0.1% Pb, up to 0.2 % Ti, up to 1% Ni, up to 1% Cu, up to 0.3% Co, up to 0.5% Mn, up to 0.2% Cr, up to 0.5% Sr, up to 3 , 0% Fe, up to 0.1% B, up to 0.1% Bi, up to 0.1% Cd and traces of rare earths and other unavoidable impurities, where for the ratio of Al content% A1 to Mg Content% Mg applies:% Al /% Mg ⁇ 1.
  • compositions of a melt bath suitable for coating flat steel products of the type in question are described, for example, in EP 1 857 566 A1, EP 2 055 799 A1 and EP 1 693 477 AI described.
  • the magnesium-based, zinc-based coatings of this type are also referred to in practice as "ZM coatings".
  • molten bath composition which, in addition to Zn and unavoidable impurities, has proven to be 0.1-0.15% by weight Al contains up to 0.5% Fe.
  • An Al-based free coating of Zn to unavoidable traces typically contains up to 15.0 wt% Si and up to 5.0% Fe in addition to Al and unavoidable impurities. Coatings of this type are referred to in practice as "AS coatings".
  • TP1> TP2> TP3> TP4 follows, the oxidation potential is the respective one
  • Heating atmosphere (dew point TP1), the holding atmosphere (dew point TP2), the optional existing
  • Band temperature and the short residence time may have previously newly formed outer oxides in the overaging step itself and in the subsequently passed
  • Steps can not be reduced.
  • the dew point TP4 of the trunk atmosphere prevailing in the trunk is set to be smaller than or equal to the dew point TP3 of the over-aging atmosphere and thus smaller than the dew point TP2 of the holding atmosphere.
  • Flow rate and the pressure gradient are regulated. Flow velocity and pressure gradient can be manipulated thereby, that the exhaust performance of the exhaust gas discharge, which is typically positioned at the beginning of the oven, adapted to the respective requirements. Locally, the flow rate of the
  • each a moist medium be initiated. This is generally done by adding an oxidative medium containing steam,
  • a humidified N 2 -H 2 - may be or N 2 -0 2 -Mix or 0. 2
  • the addition takes place via at least one supply line per zone of furnace to be moistened, which leads to
  • Simplification of the control is separated from the inert gas supply line.
  • flat steel products Due to its mechanical properties and surface properties, flat steel products are excellently suited for single or multi-stage cold or hot forming to a sheet metal component.
  • flat steel products produced according to the invention have a good formability and a high resistance to thermal and corrosive environmental pollution.
  • the application of a hot-dip coated steel flat product according to the invention thus not only allows optimal use of lightweight potentials, but also prolongs the life of the product produced according to the invention
  • Steel flat product is produced, typically contains in addition to iron and unavoidable impurities (in
  • the figure shows a schematic
  • the oven zones 2 - 6 are from each too
  • the flat steel product S first enters the furnace zone 2, where it is within a
  • Heating period of 20 s under a heating atmosphere Atml to a holding temperature Tl is heated.
  • the furnace zone 3 is followed by the furnace zone 4, in which the flat steel product S within 10 s on a
  • Schmelzenbadkessel 7 is filled.
  • the flat steel product S is held at the band inlet temperature T2 under a snout atmosphere Atm4.
  • Flat steel product S is typically a cold-rolled steel strip in the hard-rolled state.
  • the holding temperature T1 obtained in the oven zone 2 is the composition of the furnace zone 2
  • Table 4 shows the results of tests Vi - V18. It can be seen that in the noninventive embodiments 4, 5, 6, 11, 12 and 18, in which the adjustment of the dew points TP1, TP2, TP3, TP4 did not follow the proviso TP1> TP2> TP3> TP4 according to the invention and, if appropriate further deviations from the specifications of the invention were present, as well as in the embodiments 15 and 17, in which each one of the dew points TP1 or TP2 was outside the predetermined respective range according to the invention, only insufficient coating results have been achieved. In contrast, the experiments carried out according to the invention each showed optimal

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
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Abstract

L'invention concerne un procédé qui permet l'affinage par immersion à chaud à processus stable de produits plat en acier en alliage de nickel (S), de manière efficace d'un point de vue coûts et ressources. A cette fin, le procédé comprend les étapes de travail suivantes : a) préparation d'un produit plat en acier (S), en un acier contenant ≥ 2,0 % en poids de Ni et ≥ 5,0 % en poids de Cr ; b) chauffage du produit en acier plat (S) en 1 - 30 s à une température de maintien de 700 - 1100 °C sous une atmosphère de chauffage (Atm1) de N2 et contenant à chaque fois éventuellement (en % en volume) 1 - 50 % de H2, 0,1 - 2,0 % de CO, 5,0 - 15,0 % de CO2, présentant un point de rosée de TP1 -15 - +30 °C ; c) maintien du produit en acier plat (S) à la température de maintien sur une durée de maintien de 10 - 120 s sous une atmosphère de maintien (Atm2) de N2 et (en % en volume) 1,0 - 50,0 % de H2 et ≤ 1,0 % d'O2, présentant un point de rosée TP2 de -30 - 0 °C ; d) refroidissement du produit en acier plat (S) de la température de maintien à une température d'entrée de la bande de 430 - 800 °C ; e) passage du produit en acier plat (S) dans une zone de museau (6), dans laquelle règne une atmosphère de museau (Atm4) inerte ou réductrice, et passage du produit plat en acier à travers un bain en fusion (B) ; où TP1 > TP2 > TP4.
PCT/EP2012/075402 2012-02-08 2012-12-13 Procédé pour le revêtement par immersion à chaud d'un produit plat en acier WO2013117273A1 (fr)

Priority Applications (7)

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JP2014555957A JP5796142B2 (ja) 2012-02-08 2012-12-13 鋼板材の溶融めっき法
KR1020147025029A KR101994989B1 (ko) 2012-02-08 2012-12-13 평탄형 강 제품의 용융 도금 방법
CN201280069241.0A CN104245995B (zh) 2012-02-08 2012-12-13 扁钢产品的热浸镀层方法
EP12810177.1A EP2812458B8 (fr) 2012-02-08 2012-12-13 Procédé pour le revêtement par immersion à chaud d'un produit plat en acier
US14/377,337 US9803270B2 (en) 2012-02-08 2012-12-13 Method for hot-dip coating of a steel flat product
IN1579MUN2014 IN2014MN01579A (fr) 2012-02-08 2012-12-13
ES12810177.1T ES2593531T3 (es) 2012-02-08 2012-12-13 Procedimiento para el revestimiento de un producto plano de acero por inmersión en baño fundido

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DE102012101018.8 2012-02-08
DE102012101018A DE102012101018B3 (de) 2012-02-08 2012-02-08 Verfahren zum Schmelztauchbeschichten eines Stahlflachprodukts

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ES2851199T3 (es) * 2013-07-03 2021-09-03 Outokumpu Nirosta Gmbh Procedimiento para recubrir productos planos de acero con una capa protectora metálica
JP6131919B2 (ja) * 2014-07-07 2017-05-24 Ｊｆｅスチール株式会社 合金化溶融亜鉛めっき鋼板の製造方法
DE102014109943B3 (de) 2014-07-16 2015-11-05 Thyssenkrupp Ag Stahlprodukt mit einer Korrosionsschutzbeschichtung aus einer Aluminiumlegierung sowie Verfahren zu dessen Herstellung
WO2017054870A1 (fr) * 2015-09-30 2017-04-06 Thyssenkrupp Steel Europe Ag Produit plat en acier pourvu d'un revêtement de protection recuit après galvanisation et procédé de production de celui-ci
JP6237937B2 (ja) * 2016-03-11 2017-11-29 Ｊｆｅスチール株式会社 高強度溶融亜鉛めっき鋼板の製造方法
EP3502300B1 (fr) 2016-10-25 2021-01-13 JFE Steel Corporation Procédé de production d'une tôle d'acier de haute résistance galvanisée à chaud
DE102016222993A1 (de) * 2016-11-22 2018-05-24 Volkswagen Aktiengesellschaft Verfahren zur Herstellung eines beschichteten Stahlbauteils
DE102018100842B3 (de) * 2018-01-16 2019-05-09 Ebner Industrieofenbau Gmbh Durchlaufofen für Aluminiumbänder
CN112522591B (zh) * 2019-09-19 2022-03-18 宝山钢铁股份有限公司 一种薄带连铸生产高强高耐蚀钢的方法
CN113969336B (zh) * 2020-07-23 2023-03-28 宝山钢铁股份有限公司 一种热镀锌钢板的制造方法、钢板及车用构件
CN115351295B (zh) * 2022-08-26 2023-10-27 河北建筑工程学院 一种复合板制备工艺

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EP1612288A1 (fr) 2003-04-10 2006-01-04 Nippon Steel Corporation Feuille d'acier galvanisee a resistance elevee et son procede de production
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EP1857566A1 (fr) 2006-05-15 2007-11-21 ThyssenKrupp Steel AG Produit d'acier plat revêtu avec une revêtement de protection contre la corrosion et procédé de son fabrication
EP2009128A1 (fr) 2007-06-29 2008-12-31 ArcelorMittal France Acier au silicium galvanisé ou recuit après galvanisation
EP2184376A1 (fr) 2007-07-31 2010-05-12 Nisshin Steel Co., Ltd. Tôle d'acier aluminée pour éléments de passage de gaz d'échappement de cyclomoteurs excellente en termes de résistance à haute température et éléments de passage de gaz d'échappement de cyclomoteurs
EP2055799A1 (fr) 2007-11-05 2009-05-06 ThyssenKrupp Steel AG Produit en tôle d'acier doté d'une coiffe métallique anti-corrosion et procédé de production d'une coiffe Zn-Mg métallique anti-corrosion sur un produit en tôle d'acier
WO2012028465A1 (fr) * 2010-08-31 2012-03-08 Thyssenkrupp Steel Europe Ag Procédé de revêtement par immersion à chaud d'un produit plat en acier

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KR101994989B1 (ko) 2019-07-02
JP5796142B2 (ja) 2015-10-21
US9803270B2 (en) 2017-10-31
DE102012101018B3 (de) 2013-03-14
IN2014MN01579A (fr) 2015-05-15
US20150345002A1 (en) 2015-12-03
EP2812458B1 (fr) 2016-06-29
CN104245995A (zh) 2014-12-24
EP2812458A1 (fr) 2014-12-17
CN104245995B (zh) 2016-08-03
ES2593531T3 (es) 2016-12-09
JP2015509556A (ja) 2015-03-30
KR20140128416A (ko) 2014-11-05

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